JP2001015127A - Electrolytic film/electrode bonded body and solid polyelectrolyte type fuel cell - Google Patents
Electrolytic film/electrode bonded body and solid polyelectrolyte type fuel cellInfo
- Publication number
- JP2001015127A JP2001015127A JP11181845A JP18184599A JP2001015127A JP 2001015127 A JP2001015127 A JP 2001015127A JP 11181845 A JP11181845 A JP 11181845A JP 18184599 A JP18184599 A JP 18184599A JP 2001015127 A JP2001015127 A JP 2001015127A
- Authority
- JP
- Japan
- Prior art keywords
- solid polymer
- electrolyte membrane
- polymer electrolyte
- insulating film
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1007—Fuel cells with solid electrolytes with both reactants being gaseous or vaporised
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、固体高分子電解質
型燃料電池のセル構造、特に高分子電解質膜と電極との
接合体の構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cell structure of a solid polymer electrolyte fuel cell, and more particularly to a structure of a joined body of a polymer electrolyte membrane and an electrode.
【０００２】[0002]
【従来の技術】固体高分子電解質型燃料電池は、公知の
ように、固体高分子電解質膜の両主面にアノード電極と
カソード電極とが形成され、前記各電極に燃料ガスと酸
化剤ガスをそれぞれ供給することにより発電を行う発電
装置の一種である。2. Description of the Related Art As is well known, a solid polymer electrolyte fuel cell has an anode electrode and a cathode electrode formed on both main surfaces of a solid polymer electrolyte membrane, and a fuel gas and an oxidizing gas are applied to each of the electrodes. It is a type of power generation device that generates power by supplying each.
【０００３】固体高分子電解質膜には、スルホン酸基を
持つポリスチレン系の陽イオン交換膜をカチオン導電性
膜として使用したもの、フロロカーボンスルホン酸とポ
リビニリデンフロライドの混合膜、フロロカーボンマト
リックスにトリフロロエチレンをグラフト化したもの、
あるいはパーフルオロスルホン酸樹脂膜等が用いられ
る。[0003] The solid polymer electrolyte membrane uses a polystyrene-based cation exchange membrane having a sulfonic acid group as a cation conductive membrane, a mixed membrane of fluorocarbon sulfonic acid and polyvinylidene fluoride, and a trifluorocarbon matrix used as a trifluorocarbon matrix. Grafted ethylene,
Alternatively, a perfluorosulfonic acid resin film or the like is used.
【０００４】固体高分子電解質膜は、分子中にプロトン
（水素イオン）交換基を有し、飽和に含水させることに
より常温で２０Ω・cm以下の比抵抗を示し、プロトン導
電性電解質として機能する。電極基材は多孔質体で燃料
電池の反応ガス（燃料ガスと酸化剤ガス）の供給、排出
手段及び集電体として機能する。アノード電極またはカ
ソード電極においては、気相、液相及び固相の三相界面
が形成され、電極触媒の触媒作用により次のような電気
化学反応が起きる。[0004] The solid polymer electrolyte membrane has a proton (hydrogen ion) exchange group in the molecule, exhibits a specific resistance of 20 Ω · cm or less at room temperature by being saturated with water, and functions as a proton conductive electrolyte. The electrode base material is a porous body and functions as a supply / discharge means and a current collector for the reaction gas (fuel gas and oxidizing gas) of the fuel cell. At the anode electrode or the cathode electrode, a three-phase interface of a gas phase, a liquid phase, and a solid phase is formed, and the following electrochemical reaction occurs by the catalytic action of the electrode catalyst.
【０００５】 アノード ： Ｈ2→２Ｈ+＋２ｅ- カソード ： 1/2Ｏ2＋２Ｈ+＋２ｅ-→Ｈ2Ｏ すなわち、アノードにおいては燃料電池の外部より供給
された水素ガスからプロトンと電子が生成し、このプロ
トンは固体高分子電解質膜内をカソードに向かって移動
する。一方、カソードにおいては、燃料電池の外部より
供給された酸化剤ガス中の酸素と固体高分子電解質膜中
をアノードより移動してきたプロトンと外部回路を経由
してきた電子とが反応し、水を生成する。Anode: H 2 → 2H + + 2e − Cathode: 1 / 2O 2 + 2H + + 2e − → H 2 O In the anode, protons and electrons are generated from hydrogen gas supplied from outside the fuel cell. Protons move inside the solid polymer electrolyte membrane toward the cathode. On the other hand, at the cathode, oxygen in the oxidant gas supplied from the outside of the fuel cell reacts with protons moving from the anode through the solid polymer electrolyte membrane and electrons passing through the external circuit to generate water. I do.
【０００６】図５は、従来の固体高分子型燃料電池の単
セル構造を示す断面図である。固体高分子電解質膜１の
両主面には、電極触媒層２がホットプレスによる熱圧着
により一体化されており、さらにその両側に電極基材３
が固体高分子電解質膜１に縁近傍領域７で接着剤にて接
着されて固体高分子電解質膜／電極接合体（以下、電解
質膜／電極接合体という）６を構成している。さらに前
記電解質膜／電極接合体６の両面にセパレータ５が配置
されて単セルが形成されている。前記電極基材３の材料
としては、多孔性の導電性シート材、例えばカーボンペ
ーパー等が用いられる。またセパレータ５は、ガス不透
過性の材料からなり、前記電解質膜／電極接合体６と接
する側の主面に反応ガス通流路として機能する凹凸が形
成されている。FIG. 5 is a sectional view showing a single cell structure of a conventional polymer electrolyte fuel cell. Electrode catalyst layers 2 are integrated on both main surfaces of the solid polymer electrolyte membrane 1 by thermocompression bonding using a hot press.
Is adhered to the solid polymer electrolyte membrane 1 with an adhesive in an edge vicinity region 7 to form a solid polymer electrolyte membrane / electrode assembly (hereinafter, referred to as an electrolyte membrane / electrode assembly) 6. Further, separators 5 are arranged on both sides of the electrolyte membrane / electrode assembly 6 to form a single cell. As a material of the electrode substrate 3, a porous conductive sheet material, for example, carbon paper or the like is used. The separator 5 is made of a gas-impermeable material, and has irregularities functioning as a reaction gas passage on the main surface on the side in contact with the electrolyte membrane / electrode assembly 6.
【０００７】図５に示すごとく電極基材３と固体高分子
電解質膜１とはその積層方向から見た寸法が同じ、若し
くは、電極基材３の方が固体高分子電解質膜１よりも小
さくなるように形成されている。このようにカソード側
の電極基材３とアノード側の電極基材３との間に介在さ
せる固体高分子電解質膜１を前記両電極基材３と同寸法
以上にすることで、両電極基材３が接触して短絡が生じ
るのを防いでいる。As shown in FIG. 5, the dimensions of the electrode substrate 3 and the solid polymer electrolyte membrane 1 are the same as viewed from the laminating direction, or the electrode substrate 3 is smaller than the solid polymer electrolyte membrane 1. It is formed as follows. By setting the solid polymer electrolyte membrane 1 interposed between the cathode-side electrode base material 3 and the anode-side electrode base material 3 to be equal to or larger than the two electrode base materials 3 in this manner, 3 prevents short circuit from occurring.
【０００８】各電極４に供給される反応ガスは、セパレ
ータ５に設けられた図示しない反応ガス導入口及び排出
口から各単セルへ導入及び排出される。前記の反応ガス
導入口及び排出口は、固体高分子電解質膜１の電極触媒
層２が形成されていない縁近傍領域７に相対する部分に
形成されるので、固体高分子電解質膜１の縁近傍領域７
は、そのために要する幅（縁から電極触媒層２が形成さ
れている部分までの距離）を有している必要がある。The reaction gas supplied to each electrode 4 is introduced into and discharged from each unit cell through a reaction gas inlet and outlet (not shown) provided in the separator 5. Since the reaction gas inlet and outlet are formed in a portion of the solid polymer electrolyte membrane 1 corresponding to the edge vicinity region 7 where the electrode catalyst layer 2 is not formed, the vicinity of the edge of the solid polymer electrolyte membrane 1 is formed. Area 7
Needs to have a width (a distance from an edge to a portion where the electrode catalyst layer 2 is formed) required for the above.
【０００９】[0009]
【発明が解決しようとする課題】上記のように、従来の
固体高分子電解質型燃料電池では、固体高分子電解質膜
１は、電極触媒層２が形成された領域の周囲部分に電極
触媒層２が形成されていない縁近傍領域７を有してい
る。しかしながら、固体高分子電解質膜１は価格が高い
ことから、固体高分子電解質膜１の電極触媒層２が形成
されない領域は設けないか、または出来るだけ小さくす
ることが望ましい。As described above, in the conventional solid polymer electrolyte fuel cell, the solid polymer electrolyte membrane 1 has the electrode catalyst layer 2 around the region where the electrode catalyst layer 2 is formed. Are formed near the edge 7 where no is formed. However, since the solid polymer electrolyte membrane 1 is expensive, it is desirable not to provide a region of the solid polymer electrolyte membrane 1 where the electrode catalyst layer 2 is not formed or to make the region as small as possible.
【００１０】そこで、本発明は、電極４間の短絡を生ず
ることなく高価な固体高分子電解質膜１の使用量を低減
した低コストの電解質／電極接合体６及び固体高分子電
解質型燃料電池を提供するものである。Therefore, the present invention provides a low-cost electrolyte / electrode assembly 6 and a solid polymer electrolyte fuel cell in which the amount of the expensive solid polymer electrolyte membrane 1 used is reduced without causing a short circuit between the electrodes 4. To provide.
【００１１】[0011]
【課題を解決するための手段】上記の目的を達成するた
めに本発明においては、中央部に固体高分子電解質膜領
域、その周辺部に絶縁膜領域を有する固体高分子電解質
膜／絶縁膜接着シートの両主面に、アノード電極および
カソード電極とを形成することにより電解質膜／電極接
合体を構成することとする。前記絶縁膜領域はプラスチ
ックシートおよびゴムシートの何れかにより形成するこ
ととする。According to the present invention, there is provided a solid polymer electrolyte membrane / insulating film adhesive having a solid polymer electrolyte membrane region at a central portion and an insulating film region at a peripheral portion thereof. An electrolyte membrane / electrode assembly is formed by forming an anode electrode and a cathode electrode on both main surfaces of the sheet. The insulating film region is formed of either a plastic sheet or a rubber sheet.
【００１２】本願発明に係る電解質膜／電極接合体にお
いては、小面積の固体高分子電解質膜を用いることによ
り低コストが図れると共に、小面積の固体高分子電解質
膜を用いても、固体高分子電解質膜の周辺部に絶縁膜を
額縁状に設けることで固体高分子電解質膜／絶縁膜接着
シートの大きさを電極基材以上になるように形成すれ
ば、当該固体高分子電解質膜／絶縁膜接着シートの両主
面に設けられるアノード電極とカソード電極との短絡も
防止することができる。In the electrolyte membrane / electrode assembly according to the present invention, the cost can be reduced by using a small area solid polymer electrolyte membrane, and the solid polymer electrolyte membrane can be used even if a small area solid polymer electrolyte membrane is used. If the size of the solid polymer electrolyte membrane / insulating film adhesive sheet is made larger than the electrode substrate by providing the insulating film in a frame shape around the electrolyte membrane, the solid polymer electrolyte membrane / insulating film is formed. A short circuit between the anode electrode and the cathode electrode provided on both main surfaces of the adhesive sheet can also be prevented.
【００１３】さらに、本願発明においては、上記のよう
な電解質膜／電極接合体をセパレーターで挟持して固体
高分子電解質型燃料電池を構成するものとすれば、安価
な固体高分子電解質型燃料電池を得ることができる。Further, in the present invention, if a solid polymer electrolyte fuel cell is constituted by sandwiching the above-mentioned electrolyte membrane / electrode assembly with a separator, an inexpensive solid polymer electrolyte fuel cell can be obtained. Can be obtained.
【００１４】またさらに、本願発明の固体高分子型燃料
電池において、前記セパレーターの電解質膜／電極接合
体に接する側の主面の縁近傍領域が、前記固体高分子電
解質膜／絶縁膜接着シートの絶縁膜領域に直接接して積
層されることすれば、従来、アノード側セパレーターお
よびカソード側セパレータの接合部分に挿入されていた
ガス漏洩防止用ゴムシールが不要となり、部品点数およ
び製作工程を簡略化することができる。Further, in the polymer electrolyte fuel cell according to the present invention, a region near the edge of the main surface of the separator in contact with the electrolyte membrane / electrode assembly is formed by the solid polymer electrolyte membrane / insulating film adhesive sheet. If laminated directly in contact with the insulating film region, the rubber seal for preventing gas leakage, which was conventionally inserted at the junction between the anode-side separator and the cathode-side separator, becomes unnecessary, and the number of parts and the manufacturing process can be simplified. Can be.
【００１５】[0015]
【発明の実施の形態】図１は、本願発明に係る電解質膜
／電極接合体に用いられる固体高分子電解質膜／絶縁膜
接着シートの構造を示す図で、（ａ）〜（ｃ）はその断
面図を（ｄ）は当該シートの一面を上から見た図を示
す。この固体高分子電解質膜／絶縁膜接着シートは、従
来の電解質膜／電極接合体に用いられていた固体高分子
電解質膜に代えて用いられるものである。図１において
は、従来構造と同じ構成部材には同一の符号を付し説明
を省略する。FIG. 1 is a view showing the structure of a solid polymer electrolyte membrane / insulating film adhesive sheet used for an electrolyte membrane / electrode assembly according to the present invention, and (a) to (c) of FIG. (D) shows a cross-sectional view of one surface of the sheet as viewed from above. This solid polymer electrolyte membrane / insulating membrane adhesive sheet is used in place of the solid polymer electrolyte membrane used in the conventional electrolyte membrane / electrode assembly. In FIG. 1, the same components as those of the conventional structure are denoted by the same reference numerals, and description thereof will be omitted.
【００１６】図１の（ａ）は、一辺の長さが固体高分子
電解質膜１よりも大なる絶縁膜の中央部をくり抜いて額
縁状に形成した２枚の絶縁膜１０Ａにより固体高分子電
解質膜１の縁部分を挟持して接着剤で接着することによ
り、中央部に固体高分子電解質膜領域１１をその周辺部
に絶縁膜領域１２を有する１枚の固体高分子電解質膜／
絶縁膜接着シート１３に形成したものの厚さ方向の断面
構造を示したものである。（ｂ）も同様に中央部をくり
抜いて額縁状にした１枚の絶縁膜１０Ａの中央部に固体
高分子電解質１を接着剤にて接着して１枚の固体高分子
電解質膜／絶縁膜接着シート１３としたもの、（ｃ）は
中央部をくり抜いて額縁状にした１枚の絶縁膜１０Ａの
中央部に固体高分子電解質膜１を配置し、さらに、両者
を接着するのに適宜必要な大きさの絶縁膜１０Ｂを積層
してこれらを接着し、１枚の固体高分子電解質膜／絶縁
膜接着シート１３に形成したものの断面構造である。FIG. 1A shows a solid polymer electrolyte formed of two insulating films 10A formed by cutting out a central portion of an insulating film having one side longer than the solid polymer electrolyte membrane 1 and forming a frame shape. By sandwiching the edges of the membrane 1 and bonding them with an adhesive, one solid polymer electrolyte membrane having a solid polymer electrolyte membrane region 11 at the center and an insulating film region 12 at the periphery is formed.
3 shows a cross-sectional structure in the thickness direction of the insulating film adhesive sheet 13 formed. (B) Similarly, the solid polymer electrolyte 1 is adhered to the central portion of one insulating film 10A having a frame shape by hollowing out the central portion with an adhesive, thereby bonding one solid polymer electrolyte membrane / insulating film. A sheet 13 is shown. (C) shows a case in which the solid polymer electrolyte membrane 1 is disposed at the center of one insulating film 10A having a framed shape by hollowing out the center, and furthermore, necessary for adhering the two. This is a cross-sectional structure of a structure in which insulating films 10B having a size are stacked and adhered to each other and formed on one solid polymer electrolyte membrane / insulating film adhesive sheet 13.
【００１７】このような固体高分子電解質膜／絶縁膜接
着シート１３に電極触媒層２を形成した場合の構造断面
図を図２に示す。電極触媒層２の形成方法には、例えば
図１（ａ）に示す固体高分子電解質膜／絶縁膜接着シー
ト１３の両主面の固体高分子電解質領域１１に電極触媒
層２をホットプレスによる熱圧着により接着形成する方
法があり、このようにして電極触媒層２が形成された固
体高分子電解質膜／絶縁膜シート１３の断面構造は図２
（ａ）に示される。あるいは、固体高分子電解質膜／絶
縁膜接着シート１３を作製する前に、固体高分子電解質
膜１に電極触媒層２をホットプレスによる熱圧着により
接着形成しておき、その後、この電極触媒層２が形成さ
れた固体高分子電解質膜１と絶縁膜１０Ａとを接着して
も良く、このようにして電極触媒層２が形成された固体
高分子電解質膜／絶縁膜シート１３の断面構造を示す図
が図２（ｂ）である。FIG. 2 is a cross-sectional view of the structure when the electrode catalyst layer 2 is formed on the solid polymer electrolyte membrane / insulating film adhesive sheet 13. The method for forming the electrode catalyst layer 2 includes, for example, applying the electrode catalyst layer 2 to the solid polymer electrolyte regions 11 on both main surfaces of the solid polymer electrolyte membrane / insulating film adhesive sheet 13 shown in FIG. There is a method of bonding and forming by pressing, and the cross-sectional structure of the solid polymer electrolyte membrane / insulating film sheet 13 on which the electrode catalyst layer 2 is formed in this manner is shown in FIG.
It is shown in FIG. Alternatively, before the solid polymer electrolyte membrane / insulating film adhesive sheet 13 is prepared, the electrode catalyst layer 2 is bonded to the solid polymer electrolyte membrane 1 by thermocompression bonding using a hot press. A diagram showing a cross-sectional structure of the solid polymer electrolyte membrane / insulating film sheet 13 on which the electrode catalyst layer 2 is formed in this manner may be bonded to the solid polymer electrolyte membrane 1 on which the electrode catalyst layer 2 is formed. FIG. 2 (b).
【００１８】上述のようにして電極触媒層２が形成され
た固体高分子電解質膜／絶縁膜接着シート１３の両主面
の絶縁膜領域１２に接着剤を塗布した後、電極基材３を
積層して接着することにより、本願発明の電解質膜／電
極接合体を得る。その一例を図２（ｃ）に示す。図２
（ｃ）に示す電解質膜／電極接合体６は、図１（ｂ）に
示す固体高分子膜／絶縁膜接着シート１３に電極触媒層
２を形成した後、電極基材３を積層形成したものであ
る。After applying an adhesive to the insulating film regions 12 on both main surfaces of the solid polymer electrolyte membrane / insulating film adhesive sheet 13 on which the electrode catalyst layer 2 is formed as described above, the electrode substrate 3 is laminated. Then, the electrolyte membrane / electrode assembly of the present invention is obtained. An example is shown in FIG. FIG.
The electrolyte membrane / electrode assembly 6 shown in (c) is obtained by forming the electrode catalyst layer 2 on the solid polymer membrane / insulating film adhesive sheet 13 shown in FIG. It is.
【００１９】なお、固体高分子電解質膜／絶縁膜接着シ
ート１３の形成にあたっては、上述の様に中央部がくり
抜かれて額縁状に形成された絶縁膜に固体高分子電解膜
を接着する方法の他、短冊型の絶縁膜を固体高分子電解
質膜の周囲に額縁状に接着する等の方法がある。In forming the solid polymer electrolyte membrane / insulating film adhesive sheet 13, the method of bonding the solid polymer electrolyte membrane to the insulating film formed into a frame shape by cutting out the center portion as described above is used. In addition, there is a method of bonding a strip-shaped insulating film around the solid polymer electrolyte membrane in a frame shape.
【００２０】また、前者の方法においては、図３の様に
大面積の絶縁膜１０Ｃの所定部分を複数くり抜いてお
き、当該くり抜いた部分に固体高分子電解質膜１を接着
後、図中点線で示すように切り離すこととすれば簡単に
量産することが出来る。In the former method, a plurality of predetermined portions of the large-area insulating film 10C are cut out as shown in FIG. 3, and the solid polymer electrolyte membrane 1 is bonded to the cut-out portions. If it is separated as shown, it can be easily mass-produced.
【００２１】次に、図１（ａ）および図２（ａ）に示し
た固体高分子電解質膜／絶縁膜接着シートを用いて固体
高分子電解質型燃料電池を製作した場合の実施例を図４
に示す。Next, FIG. 4 shows an embodiment in which a solid polymer electrolyte fuel cell is manufactured using the solid polymer electrolyte membrane / insulating film adhesive sheet shown in FIGS. 1 (a) and 2 (a).
Shown in
【００２２】図４（ａ）は、図２（ａ）に示すように電
極触媒層２が形成された前記固体高分子電解質膜／絶縁
膜接着シート１３の両面に当該固体高分子電解質膜／絶
縁膜接着シートと同寸法の電極基材３を設けて電解質膜
／電極接合体６とし、さらにこの電解質膜／電極接合体
６をセパレーター５で挟持して固体高分子電解質型燃料
電池を構成した場合の実施例の図である。図に示すよう
に、二つのセパレータはその縁部分で互いに接している
が、この接合面からの反応ガスの漏洩を防ぐためにゴム
シール材１４を介在させている。FIG. 4 (a) shows the solid polymer electrolyte membrane / insulating film on both surfaces of the solid polymer electrolyte membrane / insulating film adhesive sheet 13 on which the electrode catalyst layer 2 is formed as shown in FIG. 2 (a). When an electrode substrate 3 having the same dimensions as the membrane adhesive sheet is provided to form an electrolyte membrane / electrode assembly 6, and the electrolyte membrane / electrode assembly 6 is sandwiched between separators 5 to form a solid polymer electrolyte fuel cell. FIG. As shown in the figure, the two separators are in contact with each other at their edge portions, but a rubber seal member 14 is interposed in order to prevent the leakage of the reaction gas from the joint surface.
【００２３】一方、図４（ｂ）は、図２（ａ）に示すよ
うに電極触媒層２が形成された前記固体高分子電解質膜
／絶縁膜接着シート１３の両面に、当該前記固体高分子
電解質膜／絶縁膜接着シート１３よりも一回り小さい寸
法の電極基材３を設けて電解質膜／電極接合体６とし、
さらにこの電解質膜／電極接合体６をセパレーター５で
挟持した場合の実施例を示している。本構成において
は、アノード側およびカソード側セパレーター５の電解
質膜／電極接合体６に相対する側の主面の縁近傍領域
が、固体高分子電解質膜／絶縁膜接着シート１３の絶縁
膜領域１２（図１）に直接接して積層されることとなる
ので、図４（ａ）の構成において用いられているガス漏
洩防止用のゴムシール材１４を省略することができると
いう利点がある。On the other hand, FIG. 4B shows the solid polymer electrolyte membrane / insulating film adhesive sheet 13 on which the electrode catalyst layer 2 is formed as shown in FIG. An electrode substrate 3 having a size slightly smaller than the electrolyte membrane / insulating film adhesive sheet 13 is provided to form an electrolyte membrane / electrode assembly 6,
Further, an embodiment in which the electrolyte membrane / electrode assembly 6 is sandwiched between separators 5 is shown. In the present configuration, the region near the edge of the main surface of the anode-side and cathode-side separators 5 on the side facing the electrolyte membrane / electrode assembly 6 is the insulating film region 12 of the solid polymer electrolyte membrane / insulating film adhesive sheet 13 ( Since it is laminated directly in contact with FIG. 1), there is an advantage that the rubber seal member 14 for preventing gas leakage used in the configuration of FIG. 4A can be omitted.
【００２４】なお、これらの固体高分子電解質型燃料電
池のセパレーター５には、アノード電極およびカソード
電極に導いて発電反応に供される燃料ガスおよび酸化剤
ガスの通流溝として機能する凹凸が形成されている。こ
の反応ガス通流溝へ反応ガスを導入するための反応ガス
導入口８が、セパレーター５の固体高分子電解質膜／絶
縁膜接着シート１３の絶縁膜領域１２に相対する部分に
形成される。The separators 5 of these solid polymer electrolyte fuel cells have irregularities which function as flow grooves for fuel gas and oxidizing gas which are guided to the anode electrode and the cathode electrode and used for the power generation reaction. Have been. A reaction gas inlet 8 for introducing a reaction gas into the reaction gas flow groove is formed in a portion of the separator 5 corresponding to the insulating film region 12 of the solid polymer electrolyte membrane / insulating film adhesive sheet 13.
【００２５】本発明では、固体高分子電解質膜／絶縁膜
接着シート１３に用いる絶縁膜（１０Ａ〜１０Ｃ）とし
て、例えばポリエチレンテレフタラート、ポリエチレン
等からなる汎用的なプラスチックシート及びゴムシート
等が用いられる。また、電極基材３としては、例えばカ
ーボンペーパー等の多孔性導電性シートを用いることが
できる。In the present invention, as the insulating film (10A to 10C) used for the solid polymer electrolyte membrane / insulating film adhesive sheet 13, for example, a general-purpose plastic sheet made of polyethylene terephthalate, polyethylene, or the like, a rubber sheet, or the like is used. . Further, as the electrode base material 3, for example, a porous conductive sheet such as carbon paper can be used.
【００２６】[0026]
【発明の効果】上述のように、本発明によれば、固体高
分子電解質膜の縁近傍領域に額縁状に絶縁膜を配置して
接着して固体高分子電解質膜／絶縁膜接着シートを形成
し、これを介してアノード電極及びカソード電極とが配
設されてなる電解質膜／電極接合体とすることにより、 （１）高価な固体高分子電解質膜の使用量を従来より大
幅に低減した固体高分子膜／電極接合体が製造できるた
め、低コスト化が図れる。As described above, according to the present invention, a solid polymer electrolyte membrane / insulating film adhesive sheet is formed by arranging and bonding a frame-like insulating film in the vicinity of the edge of the solid polymer electrolyte membrane. The electrolyte membrane / electrode assembly in which the anode electrode and the cathode electrode are disposed via this, (1) a solid material in which the amount of expensive solid polymer electrolyte membrane used is greatly reduced Since a polymer membrane / electrode assembly can be manufactured, cost reduction can be achieved.
【００２７】（２）固体高分子電解質膜の周囲が絶縁膜
により保護されることとなるので、電解質膜／電極接合
体の製造工程において、特に手作業での取り扱いが容易
になり、発電性能に影響する固体高分子電解質膜の損傷
等が減って歩留まりが向上した。(2) Since the periphery of the solid polymer electrolyte membrane is protected by the insulating film, in the manufacturing process of the electrolyte membrane / electrode assembly, handling by manual operation becomes particularly easy and power generation performance is reduced. The yield was improved by reducing the influence of damage to the solid polymer electrolyte membrane.
【００２８】（３）さらに、上記本発明に係る電解質膜
／電極接合体をセパレータで挟持して単セルを形成する
場合においては、固体高分子電解質膜／絶縁膜接着シー
トの絶縁膜領域の両主面にセパレータの縁近傍領域が直
接接触して積層される構成とすれば、アノード側セパレ
ータとカソード側セパレータとの接合部分に従来介在さ
せていたガス漏洩防止用のゴムシール材が不用となり、
セル構造が簡略化され、コストの低減を図ることができ
る。(3) In the case where the electrolyte membrane / electrode assembly according to the present invention is sandwiched between separators to form a single cell, both the solid polymer electrolyte membrane / insulating film area of the insulating film adhesive sheet may be used. If a configuration is adopted in which the region near the edge of the separator is directly contacted and laminated on the main surface, a rubber seal material for preventing gas leakage, which has conventionally been interposed at the joint portion between the anode side separator and the cathode side separator, becomes unnecessary,
The cell structure is simplified, and the cost can be reduced.
【図１】本発明の実施例に係る固体高分子電解質型燃料
電池の電解質膜／電極接合体に用いられる固体高分子電
解質膜／絶縁膜接着シートの構造を示す断面図。FIG. 1 is a cross-sectional view showing the structure of a solid polymer electrolyte membrane / insulating film adhesive sheet used for an electrolyte membrane / electrode assembly of a solid polymer electrolyte fuel cell according to an embodiment of the present invention.
【図２】本発明に係る電解質膜／電極接合体の製造過程
段階における構造断面図。FIG. 2 is a structural cross-sectional view of an electrolyte membrane / electrode assembly according to the present invention in a manufacturing process.
【図３】本発明に係る固体高分子電解質膜／絶縁膜接着
シートの量産過程の一例を示す図。FIG. 3 is a diagram showing an example of a mass production process of the solid polymer electrolyte membrane / insulating film adhesive sheet according to the present invention.
【図４】本発明に係る固体高分子電解質型燃料電池の構
造を示す断面図。FIG. 4 is a cross-sectional view showing the structure of a solid polymer electrolyte fuel cell according to the present invention.
【図５】従来の固体高分子電解質型燃料電池の単セル構
造を示す断面図。FIG. 5 is a cross-sectional view showing a single cell structure of a conventional solid polymer electrolyte fuel cell.
１ 固体高分子電解質膜 ２ 電極触媒層 ３ 電極基材 ４ 電極 ５ セパレータ ６ 電解質膜／電極接合体 ７ 縁近傍領域 ８ 反応ガス導入口 ９ 反応ガス排出口 １０ 絶縁膜 １１ 固体高分子電解質膜領域 １２ 絶縁膜領域 １３ 固体高分子電解質膜／絶縁膜接着シート １４ ゴムシール材 DESCRIPTION OF SYMBOLS 1 Solid polymer electrolyte membrane 2 Electrode catalyst layer 3 Electrode base material 4 Electrode 5 Separator 6 Electrolyte membrane / electrode assembly 7 Edge vicinity area 8 Reaction gas inlet 9 Reaction gas outlet 10 Insulation film 11 Solid polymer electrolyte membrane area 12 Insulating film area 13 Solid polymer electrolyte membrane / insulating film adhesive sheet 14 Rubber seal material
Claims (4)
辺部に絶縁膜領域を有する固体高分子電解質膜／絶縁膜
接着シートと、当該シートの両主面に形成されたアノー
ド電極およびカソード電極とから成ることを特徴とする
電解質膜／電極接合体。1. A solid polymer electrolyte membrane / insulating film adhesive sheet having a solid polymer electrolyte membrane region in a central portion and an insulating film region in a peripheral portion thereof, and an anode electrode and a cathode formed on both main surfaces of the sheet. An electrolyte membrane / electrode assembly comprising an electrode.
びゴムシートの何れかから成ることを特徴とする請求項
１記載の電解質膜／電極接合体。2. The electrolyte membrane / electrode assembly according to claim 1, wherein said insulating film region is made of one of a plastic sheet and a rubber sheet.
膜／電極接合体をセパレーターで挟持して成る固体高分
子電解質型燃料電池。3. A solid polymer electrolyte fuel cell comprising the electrolyte membrane / electrode assembly according to claim 1 sandwiched between separators.
池において、前記セパレーターの電解質膜／電極接合体
に接する側の主面の縁近傍領域が、前記固体高分子電解
質膜／絶縁膜接着シートの絶縁膜領域に直接接して積層
されることを特徴とする固体高分子電解質型燃料電池。4. The solid polymer electrolyte fuel cell according to claim 3, wherein a region near the edge of the main surface of the separator in contact with the electrolyte membrane / electrode assembly is the solid polymer electrolyte membrane / insulating film adhesive. A solid polymer electrolyte fuel cell, wherein the fuel cell is laminated directly in contact with an insulating film region of a sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11181845A JP2001015127A (en) | 1999-06-28 | 1999-06-28 | Electrolytic film/electrode bonded body and solid polyelectrolyte type fuel cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11181845A JP2001015127A (en) | 1999-06-28 | 1999-06-28 | Electrolytic film/electrode bonded body and solid polyelectrolyte type fuel cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001015127A true JP2001015127A (en) | 2001-01-19 |
Family
ID=16107832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11181845A Pending JP2001015127A (en) | 1999-06-28 | 1999-06-28 | Electrolytic film/electrode bonded body and solid polyelectrolyte type fuel cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001015127A (en) |
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|---|---|---|---|---|
| JP2003068318A (en) * | 2001-08-23 | 2003-03-07 | Osaka Gas Co Ltd | Cell of solid polymer fuel cell and solid polymer fuel cell |
| JP2006185613A (en) * | 2004-12-24 | 2006-07-13 | Nissan Motor Co Ltd | Fuel cell stack |
| WO2006112919A2 (en) * | 2005-04-12 | 2006-10-26 | General Electric Company | Electrochemical cell structure |
| JP2007324012A (en) * | 2006-06-02 | 2007-12-13 | Sony Corp | Electrochemical device |
| US7425383B2 (en) | 2001-10-31 | 2008-09-16 | Hitachi, Ltd. | Electrode for polymer electrolyte fuel cell, separator therefore, and polymer electrolyte fuel cell, and generating system using them |
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1999
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| US8551668B2 (en) | 2003-08-22 | 2013-10-08 | Johnson Matthey Fuel Cells Limited | Sealing of a membrane electrode assembly |
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| US8273495B2 (en) | 2005-04-12 | 2012-09-25 | General Electric Company | Electrochemical cell structure and method of making the same |
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| WO2009069771A1 (en) * | 2007-11-28 | 2009-06-04 | Toyota Jidosha Kabushiki Kaisha | Unit cell of fuel battery |
| JP5024386B2 (en) * | 2007-11-28 | 2012-09-12 | トヨタ自動車株式会社 | Fuel cell single cell |
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